Your description of your chronic allergies “being worse than ever” suggests that the tissues in your nose and possibly your sinuses as well are more inflamed than usual and that would be a common cause of the very minimal amount of blood in your mucous. If blood continues to appear when your allergies have quieted down, you should have a careful examination of your nose and throat.
Not all anti-histamine have the adverse side effect of nervousness. Your doctor you be able to suggest one that is effective with minimal side effects such as the so-called Non-Sedating Antihistamines. Another effective drug treatment would be an inhaled nasal steroid and these usually have minimal or no side effects.
Finally if the most troublesome of your allergies have been identified, you should do everything possible to avoid them and, if avoidance is not possible, to minimize your exposure and thus the amount of allergen you breathe in.
I failed to mention that this year I was blowing my nose more then ever and when my allergies started getting bad, I had a very visable amount of blood from my nose and than I started checking my mucous, if I was not checking it I probably would never have noticed it, the spots are so small. my pnd is more watery than mucous after I am awake for about 1 hour.