I had Delta back in November, nearly 8 weeks ago now. I was very ill and not really able to function for 2 weeks and then suffered from significant fatigue for another 4-5 weeks that was exacerbated by even mild activity (like going for a walk). I had just started to get back to normal-ish in the run up to Christmas when I caught a cold off a family member (fairly confident where it came from because I was social distancing in advance of Christmas) and it has made me really ill again. I spent all of Christmas in bed and can still hardly get off the sofa. If I go for a walk it's basically the main event of the day. It isn't Covid because I test daily and am negative. I can't use a PCR because it would still test positive from having Delta.
Does anyone understand why a cold would make me this ill in the wake of having Covid? I started a new job just before Christmas and am anxious that I still won't be well when I need to go back. I also live alone and am beginning to struggle from a MH perspective from all the isolation and now not being able to get out or even do anything at home. Is there anything I can do to aid recovery? The advice online is so varied and some of it frankly alarming.
NB I am 40, otherwise healthy and triple-vaccinated.