If you notice a problem with lactose then you can experiment yourself. Maybe drink soy milk instead of regular milk or even almond milk which I heard is a treat. You can cut out lactose completely and if your symptoms improve it may give you an answer. The problem with food allergy tests is they have a high inaccuracy record so you may get a false negative. It may be interesting though if you want to see what it says.
I'm sorry you have to deal with both UC and IBS. I was told last year that I had UC because I had ulceration and inflammation in my colon however that has cleared up totally and my doc has said it was a flukish thing (ideopathic) that he is now stating was caused by my UCTD attacking my intestines. Colitis is horrible and I feel for you.
Co-Moderator ~ IBS Forum
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Dx: IBS 1989, Diverticulosis 2004, Idiopathic Acute Colitis 2006, UCTD 2007
Meds: Plaquenil 400mg, Chlorzoxazone 500mg, Lyrica 50mg, Protonix 40mg, Naproxen 1000mg, Klonopin 2mg/day (tapering to PRN), Miralax 17g, Supplements