allergies, depressed, too tired to sing

by Dorie.
(WA, USA)

I have allergies to wheat, eggs and milk (these caused respiratory problems),as well as the nightshade family of vegetables these cause swelling of my little fingers at the last joint). My husband passed away 2& 1/2 years ago. I am better with the grief part but suddenly find myself so sad for no reason, not always but sometimes it overwhelms me to tears. Could this be allergy too? This year has been especially bad for pollen allergies which did not seem to bother me that much before

I am a singer but now sometimes I am too tired to sing which had never been the case in my life. I could sing through every trial, but now I am overcome.

Thanks you for your guidance.