The main lingering symptom for me was periods of discomfort in the thymus and to a lesser extent swelling in my lymph nodes under the armpits, mainly cropping up when I was tired [much more easily than usual], undergoing physical exercise, or drinking even small quantities of alcohol. Assume this was my immune system being more easily stressed than usual. Seems to have subsided as a response to fatigue now, and I can happily go running or stay up later without issue.

All I've done are the generic health recommendations [sleep more, eat well, avoid alcohol, take regular low intensity exercise, avoid sources of stress]