hmm really all I do is condition my hair with tresseme thermal repair con and shampoo with thermal repair poo. I like both products. This is all I use (suprisingly since im on a hairboard), and I wash weekly and then use my flatiron and blowdrier.
So you shampoo, quick condition, blow dry and flat iron once a week? I can see why you're having problems.
I don't know the ingredients in your shampoo but if it has sulfates it's probably causing some dryness which is further exacerbated by the lack of serious conditioning, no moisturizing, and using heat often with no protection.
Does that conditioner have a lot of silicones which could be causing build up and drying out your hair?
My suggestion is that you start from scratch.
1. Clarify your hair to get rid of any build up that is left over from your protein treatments, shampoo, and conditioner. You can get the cheap suave clarifier. It's pretty harsh though so I'd dilute it with water before using it.
2. After clarifying you need to DC. Here's where you'll have to do some detective work. You know your hair best so you need to make sure you get a DC with ingredients that will work best for your hair. It should be moisturizing and have some sort of protein (to provide structure). It also needs to be a real DC, so something that says leave it on for more than a few minutes or is a mask. In the past I've used NTM mask (it comes in a jar) and I loved it. It's also pretty easy to find. People also seem to really like the Yes to Carrots mud mask.
You may also want to get a protein conditioner to have on hand in case you decide to do protein in conjunction with your moisture DC. ORS packs have protein in them and are considered a light-medium protein, depending on who you ask. Or you could get the aphogee 2min, just make sure you follow it with a moisturizing conditioner.
You said you already did an aphogee...was it the 2-step or the 2min? If you already did the 2-step you definitely shouldn't do another hardcore one soon after...at least until you've properly assessed your hair. Using the ORS packs or aphogee 2min may help you maintain your protein level if you've already done the hardcore. You should read up on protein-moisture balance before you do any more protein though.
3. Moisturize. If you don't have anything already then you'll want to get something. Make sure it's something that is moisturizing, has some protein, and isn't filled with cones or mineral oil/petroleum (which can lead to more dryness/breakage).
Optional step: sealing with oil. You can seal with an oil after you moisturize, which many people find helpful. If you do it, I suggest using a natural oil like coconut or olive which also provide conditioning benefits to the hair.
4. Protective style. Since you have pretty long hair I suggest you bun it for a while. Just make sure you are moisturizing your hair daily and paying attention to how it feels. Make sure you are gentle with your hair and not over manipulating it now while it is weak.
Read
this thread before you go out and buy anything though. It will help you pinpoint your issues and make good decisions about which products to buy. Also, definitely read the hair breakage 101 thread I posted earlier. It seems like you need to get some basic hair education going on so that you can build a good regimen.