I have had my heart looked at all is well.....However I am still having chest pains and when I do anything I het real clammy and sweaty and naseated?

Heart evaluation. When you say you had your heart looked at, what did they do? Just an ekg? That's not enough. With your symptoms you should probably have a nuclear stress test. Heart tests can be false negative at times. A heart cause is very possible and needs to be fully ruled out. Other causes would be lung problems with low oxygen, deconditioning, depression, h pylori infection of the stomach, acid reflux, etc.