Feeling Tired and Heavy

I have tried making smarter choices and eating healthier to at least maintain my present weight.  I've been resigned to the fact that I will not lose those excess pounds if I didn't work out. But what I cannot understand is, I still kept gaining.  I know whole-wheat crackers are way much better than potato chips, but that didn't work either.  Been looking up for some of the best weight loss products because a friend says, they might help.  I found a product that I think would work for me. But I'd like to ask my doctor first if he would recommend it.  I am not so brave when it comes to these things.