You might try getting rid of the shampoo. Thanks to an old thread here I quit washing my hair months ago and just rinse it with hot water in the shower. Works just fine, my hair doesn't smell and my scalp is much happier. It was a bit greasy for the first few weeks as was predicted in the thread, you head goes overtime on the grease to make up for you stripping it with shampoo every morning. After a few weeks of no shampoo it clams down and all is well. I condition it once a month or so if it starts to feel heavy.

Might save enough of your hairs to make it to July.