OnlyChild, I agree with the other ladies here. Since your hair is locking and breaking where the two textures meet and your relaxed hair looks weak and thin, I would NOT - repeat, NOT - relax. You have to treat your hair to some good ole TLC and nurture it back to health, because right now a relaxer could ruin all of your hard earned growth (six inches - that's amazing!!!).
Correct me if I'm wrong, but it sounds as if you didn't completely loosen the tangles before you washed your hair, an absolute must after removing braids. Use the best moisturizer you have at home - Carrot Oil, Profectiv, curl activator, whatever - and loosen those knots thoroughly before washing again. Don't rush because this will definitely take some time. When you do wash your hair again, use a really moisturizing and detangling shampoo. The Creme of Nature that Armyqt recommended is wonderful. I used this last night for the first time in a long time, and it makes your hair feel just great. A mild protein conditioner won't make your hair hard and tangled like some of the heavy hitters will. Use a good moisturizing conditioner afterwards, and then soak your hair in the best moisturizers you have (Carrot Oil, etc). Comb through your hair very carefully. It will probably take time to remove the knots, but if you don't you could lose that locked/tangled hair. Good luck and keep us posted.