Living with Long-haul COVID

I've been diagnosed with he Covid-19 long haulers syndrome by a matter of eliminating other diseases including heart and lung disease.  I'm also bipolar so this is very hard on me mentally.  I have constant fatigue, shortness of breath with moderate exertion, dizziness, extreme thirst, and brain fog.  I had the virus in December of 2020 and these symptoms have persisted ever since.  I've had the vaccine (Johnson & Johnson) and no improvement after that.  The doctors say they aren't even sure how long the syndrome will last.  Some people are "cured" in a few weeks, others it seems to go on.   They only treat symptoms.  I basically have no treatable symptoms.  I'm trying to increase my stamina by walking and I joined a health club and will be doing senior exercise classes( I'm 65).  I stay hydrated the best I can.  The cardiologist told me I had the heart of an 18 year old!  And so I don't have to worry about the palpitations that I get.  My lungs are fine.  My lab work was spot on so nothing showed up to indicate anything abnormal.  I have to live with this awhile!  My "new normal"!