breathing

I have always had allergies but for the last two years as soon as the sun goes down(approximately 1 hour after sunset) my allergies come on severely causing extreme agitation, fast heartbeat, a difficulty to breathe,pain in my legs, severe itching of shin on my right hand and forearm.I can't focus, I'm highly irratible and can't seem to relax--I am a56 yrs old and can't understand nor deal with this problem..what is causing it and why the very high anxiety and agitation level?  Any thoughts on this?

[National Jewish]

The timing of the symptoms you describe could be related to different things (allergic and non-allergic), such as mold counts, which go higher in the dark. However, the set of symptoms you have described are not typical of allergy, particularly the anxiety and agitation. I would suggest keeping a good diary for a month describing all the symptoms, the times they occur and go away, the ways you control them etc. I would take this diary to your physician who may or may not refer you to an allergist to determine whether there is any allergy related cause to them.