You could do a covid test for peace of mind.

It's a little hot, but steam sometimes helps. Try putting a Vicks on your feet. If you suspect asthma get medical assistance.

I would just add to the above comments that you should be sure to drink plenty of fluids. If you mean, sick phlegm, could you have an infection? Just a few thoughts. Hope what ever it is, hope it goes away soon! Hugs

in addition you might consider eliminating dairy products till you feel better.

When you have mobility issues don't forget about Uber and Lyft transport services. You can hire a car with a wheelchair. I know it costs a bit but that's better than missing an Dr appointment.