Well, I'm a believer in motions CPR--it has kept my hair on my head faithfully for almost two years now. However, when I'm in a crisis like the one you described (was there in january), I break out the serious protein til the breakage stops. I use Aphogee treatment for damaged hair followed by a moisturizing conditioner (whatever I have on hand). Mid week, I'd do a CW with CPR (also like ORS hair mayo). I kept repeating the Aphogee weekly, yes weekly, until the breakage stopped--this only took two treatments. After that I return to my regular protein treatments weekly, like CPR or ORS mayo (I think they're about equal) with CW's in between if I'm still feeling insecure.
In january my hair started snapping so much (bought new 1875 watt dryer) and this regimen stopped the breakage before it got out of hand. Now I try to aphogee about every 4-6 weeks and I use my hair mayo (or CPR) weekly. I haven't had a problem since. I know you're probably trying to avoid buying another product, but if your hair really is starting to break, I would advise starting with Aphogee treatment for damaged hair. If you've never used it before, follow the directions and follow with a good moisturizing treatment. Good luck--keep that pretty hair healthy.