Help

I'm really worried bout my hair I had it dyed 4 ish weeks ago previously was a brown with blonde hightlights before that i was blonde and went brown around oct/nov 07 now warm brown with blonde icons. For the first week or two its been fine but the last 2 weeks its been breaking it looks dull and fuzzy. I do straighten my hair alot but about the same time I had it coloured I brought the GHD sampoo and Conditioner and heat protector and I've used it as advised but I hate the way the shampoo and conditioner feel on my hair and the heat protector is horrible (I was told in the shop when using a heat protector to spray but let it dry before straightening they don't do this in salons???) anyway I've brought a load of treatments from the Lee Stafford range to try and help and yesterday I used the aussi shampoo and 3 minute miracle conditioner and although its not great it is looking better i'm also trying to lay of the straighteners which is really hard!!!

Anyway am I ok to use these treatments? What heat defence spray should I use for those now odd occassions where I stand it no longer and will I be able to have it dyed dark brown at the begin of july???

sorry for all the questions hope i've made sense...

Thanks Tracy x