SFN should not be a problem with pregnancy. The extra water weight may aggravate some symptoms but this will be temporary.
The sensations you describe are common to most of us and you should find that you get used to many of them over time as suggested. Also it is important to realize that since this is a disease where the nerve fibers themselves are deteriorating the signals do not correspond to the severity of the problem. Sharp and severe pain does not necessarily mean that you are getting worse or that there is something to worry about.
There is no therapeutic benefit to most PN medications beyond symptom relief, and no problem with staying off medication while pregnant.
It is unfortunate that you have to deal with this diagnosis while you are pregnant but try to concentrate on taking care of yourself and having a healthy pregnancy despite SFN. You have far more control over that than you do over the neuropathy symptoms.
Has gestational diabetes been a concern for you?