I just researched your #2 and found this under healthline dot com:
"If you’re looking for natural alternatives to help manage your depression or anxiety, tryptophan-rich foods may be helpful. Remember that these foods [eggs, cheese, pineapple, tofu, salmon, nuts and seeds, turkey] must be combined with healthy carbohydrates [rice, oatmeal, whole grain bread] in order to affect serotonin levels.
"Exercise, light therapy, and a high fiber diet are also good ways to naturally boost your serotonin levels and overall mood..."
My anxiety onslaught occurred during a week in which I was unable to do my usual exercise routine, so I think they could be related in my case.
Wishing you all the best.