How long have you been riding?

Unfortunately the fact that you got a professional fit doesn't guarantee you ended up in a good position. There are good and bad fitters, or perhaps there are other factors that were not evident during the fit.

If it was just your feet, I'd be asking if the shoes were the problem. However, that list of issues is unlikely to be best treated one at a time, IMO. It seems almost certain that they're linked.

I'm NOT a fit expert, plenty here are. But how are you hurting your wrists on a triathlon bike. That can only be a fit issue. Assuming you spend most of your time on the extensions, your hands don't even support your weight so sore wrists must surely be a problem in aero bar shape and position.

The sore back, neck and butt, and your numb foot issue, could all very likely be the same cause - body position. The saddle could also be an issue but I wouldn't suggest looking at that until you're pretty sure you're sitting in something like the right position.

Probably the best place to start is to post a photo of yourself on the bike and let the experts tell you if anything looks badly wrong.

Thanks for the reply.
Yes the wrist is a fit but very minor issue and I really shouldn't have mentioned it.
Tom

They all add up and even something relatively small can detract from a ride.

Some discomfort is simply a case of giving yourself time for adaptation, which is why I asked how long you're riding. That would definitely include saddle comfort, neck/shoulder soreness and maybe the sore wrist. But if they aren't improving after the first few rides it's not your body that needs to adapt.

I’m getting the same dead feet issue. Coincides with getting a new pair of bike shoes. So I’m blaming them, never had an issue before

Bike shoe fit is tricky.

Its a more complicated interface than people imagine - there is the whole shoe-cleat-pedal interface - and a reminder that this is where your hard earned and precious power is transferred TOO the bike!

It's worth spending some time, sorting all of this out.

One thing I've noticed with Professional Bike racers is the change bike sponsors via teams frequently, but ounce they find a shoe that fits/works for them, they stick with that brand/model year after year.

Back to the OP's problem. It could be any number of a whole multitude of things here. The solution could be as simple as sliding the cleats back to the furthest point away from the toe and closest to the heel. Or it could be something well away from the actual foot - saddle issues, seat height issues etc . . .

Whenever I change shoes, it's always several weeks of fiddling around with new/old insoles, shimming the cleats, and fiddling around a bit with cleat position and angle to get it all dialed in. Two years ago I went from the Giro Empire ACC, to the newer Giro Empire SLX - one would think an easy transition, right? Wrong, these two shoes while looking the same from the outside are built on two completely different lasts!

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Steve Fleck @stevefleck | Blog

Low back, wrist and knee sound like your saddle may be too far back or not supporting you. If you're pushing on the extension to keep you on the saddle that would explain the wrist pain, the lack of support at the pelvis would force your back to stabalize you. Thats my guess

I used to ride , so I have some experience but I'm just getting back into it as of September.
I'm not whining about discomfort, I'm talking agony at the end of two hours.
But my feet seem to bother me mentally the most.
The fitter installed adapter plates to the shoes that allow more forward and rearward cleat placement, right now they are back as far as they can go. I have tried three different saddles, up down , forward and back.
My shoes are new in September, I have not tried other shoes due to the cost factor.
Thanks, Tom

i guess i should add that your cockpit could be too forward as well.

I had a similar issue where i swapped saddles and it took some time to get the fore/aft set in a way that I was fully supported. I was just dangling off the seat.