This may be temporary. I have had shooting zings, that last a day or two.
And they go away.

Same with the feeling of bugs crawling...I'll get one here and there.

The stress of all this sudden medical interest in him, and the spinal tap may have really upset him, and this stress typically magnifies most PN type symptoms.

For me stress is a big issue, so it does not surprise me that he has more symptoms now.

I'd suggest you read some of the posts here.
The B12 interventions, thiamine, metholated rubs for topical use, Lidoderm patches for severe pain. Choosing new footwear. All of these can have a positive impact to lowering symptoms.

I have had PN since my early 30's (due to a misdiagnosed thyroid condition).
While it is better now than then, it still bothers me, but I have found that proactive interventions that reduce discomfort help alot. One has to learn to live with it, however. One thing that really helps is auto-relaxation (auto hypnosis) to minimize the impact of the discomfort. Psychologists teach this, and even physical therapists in some rehabs. (I was offered this for a leg injury, and they were surprised I already knew how to do it.)

Just the thought that this is "forever" might be stressful to your husband.
So it is important to put it in a perspective that allows for minimal discomfort daily. And this is a "job" of sorts, one can not avoid.

Good luck.