Some allergy meds can cause nervousness, anxiety, agitation. I'd check out the side effects for yours online.
Anxiety, from any cause, can make you sleepless, give you a racing heartbeat, tense muscles, shakes, twitches and all kinds of strange sensations. If you don't have to take the allergy meds, maybe stay off it for a few days and see if your symptoms subside.
If that doesn't help, ask yourself if maybe you're under a lot of stress at home or at work.