1.8 is really low, and needs to be confirmed. Even without Crohn's and meds, I'd avise you to get re-tested. That's very likely to be a false positive.
Aj
I am also 35 years old with Crohn's and showed some antibodies (0.9) for HSV type 2. I belive it to be a false positive. My doctor also told me that false positives on this test are likely with Crohn's.
you need to post herpes questions on the herpes forum.
grace