I meant to add this:
All those questions I asked could help define what is happening to him. Without knowing more, I would have to say just from the looks of it that it seems like panic/anxiety. But I sure don't want to dismiss it as just that.
It needs to be investigated by a doctor who has an inquiring mind, not just one who half-listens while writing out your prescription. Good luck finding one!
Did your husband start any new medications on or before his symptoms first appeared? Is he on any daily meds? If so, what are they?
Is he under more stress than normal? Is something particularly stressful for him right now? How does he normally handle stress?
What kind of chronic health problems does your husband have? Is he diabetic? Does he have digestive problems? Kidney problems?
Did your husband start a new diet just before this started, or did he eat anything atypical to his diet? Was he eating too much of one thing? Or did he stop eating a food he normally eats? Vitamin and mineral deficiencies play a huge role in the acquisition of diseases, so the importance of proper diet cannot be overstated.
About a year ago, I had extreme jitteriness, dizziness, numbness in my legs, falling down. I realized over time that this was in part caused by Prevacid, a drug which causes your magnesium level to be depleted. This can lead to some of the symptoms I was having. I was under extreme stress as well. Every aspect of your life can play into the development of any unexplained illness. I went to 3 different doctors, including an inner ear doctor, who said everything seemed to be fine. But I wasn't. They didn't listen to me. Even though they couldn't give me any answers, they sure had no problem charging me huge bills with nothing to show for it.
In short, I did some research on my own and started on a whole foods type diet, paying closer attention to getting nutrients from food, not from man-made vitamins, which doctors now warn against. I still have some jitteriness but it's no where near as bad as before. Most of the other symptoms have gone away but it took time. And I was able to get off Prevacid altogether.
Hope this helps.