I have developed multiple food intolerances too and tried to tackle the leaky gut issue without much success.
I found that taking potassium helps with the sweats. However, last week I went to an acupuncturists (desperate times call for desperate measures) and although I have not tried eating foods I cannot tolerate, I have to say that I feel loads and loads better. The heart racing, sweats and diaorrhea have all but disappeared since the acupuncture. I feel my body has been given the chance/window to heal itself, given me a break from feeling horrid most of the time.
Needless to say, I am quite impressed.