Infusium is a great product to use on a daily basis. It is a leave in treatment. Also I would suggest you try to find St.Ives- they have a hair repair product that is WONDERFUL!! It smells of mint, I can't remember the name though. It came in a white bottle. But rare to find in the US. Also there is Aussie products- 3 minute miracle is good too.
Don't forget to use conditioner, and hot oil treatments are good as well. You may just have to cut off the too damaged ends as they may not be able to be repaired.

Have you tried rubbing coconut oil into your hands and applying sparingly onto your hair. You don't want to overdo it - too much will make your hair look greasy. Shampooing your hair less frequently also helps with the frizzies. Excess shampooing strips natural oils from the hair.