Hmm I think you can get it straightened professional which lasts a couple of months, will try and remember what it's called.
Greatgooglymoogly - find a shampoo which doesn't have SLS in it. When you wash your hair only wash the scalp with shampoo (using fingerpads) and length of hair with conditioner. If you do wash your hair everyday then use shampoo and conditioner one day then just conditioner the next. Use a clarifying shampoo once a week. Don't rub your hair when you get out of shower/bath just wrap in towel. Do not use comb/brush. Spray leave-in condition in it and then use a curl creme (I love the pink boots one) rub it in your hands until it emulsifies and then run your fingers thru your hair. Leave to dry naturally.