I agree you probably have candida to deal with as a result of the Antibiotics . Have you had a thyroid panel done? The IBS, excessive sweating and Psoriasis can be thyroid related. The correct tests are the Free T3 and Free T4 not the regular T3 and T4.
I know being in the UK it is difficult to get extensive testing but without the Free's being tested you can have thyroid issues and not know it. A lot of times candida and thyroid issues go hand in hand as they did with me. If the thyroid is left untreated long enough it can lead to adrenal fatigue which needs to be treated as well.