Feeling lousy

Left knee hurting – arthritis? Want to go for walk – nice weather for walking – but can I stand the pain?
I am also very irritable last couple days.
Disagreement over logical terminology with a friend.
I was starting to re-read some info on philosophical logic – but developed stomach ache & headache.
I may just watch NetFlix. Some shows can hold my attention.
Also I noticed I am getting error taking blood pressure on device today.
When this has happened in the past, I have notice when I finally get a reading, my blood pressure is high & pulse low (e.g. 52).
I verified the fact once at the local pharmacy – I had thought I might have a problem with my device – but the pharmacist got the same result.
I do take blood pressure medicine & have been taking it.