FOG, what you should do is something called a "progressive outline in your math classes". Since studying for psych and studying for math use two different parts of your brain, you should try to break the problem down into different steps using these progressive outlines. I did them writing step 1, then writing the problem down, since that is the first step in any problem, then step 2, do your factoring or combining of terms or whatever, then step 3, and on and on and on. Do these progressive steps going down on your paper. This will break the problem down into steps and you will get into a routine of doing each problem this way. After ALOT of practice, and I do mean ALOT of practice, it will become second nature.
Also, calculus has some new that you need to learn and apply, as well as new concepts. It's important to understand the meaning of the new concepts and new terms. When you are studying and understand the whole meaning of the term and concept, your brain is storing it better in its "Central executive" that stores information and retrieves information.
I don't think you are "math retarded" as you stated, because you've made it to Calc you so have to be pretty good at it. Don't let it get to you, and just work at it. It really helps if you can get into a study group with other people in your class. You all can support each other when you are struggling or frustrated, and make it fun. Our memory is better when we are more relaxed than when we are tense.
Try these, and if you have any questions, send me a PM. You too Satty.