Erectile Disfunction Improved by POIS Relief or Regular Process?

[god.forbid]

I have a mild erectile dysfunction at 22. Erection gets initiated pretty consistently but is very weak and hard to maintain. I have no hormonal abnormalities besides slightly elevated prolactin.
This improves drastically at around 4-5 days of abstinence but I can't identify if that's to be attributed to POIS symptoms being relieved or if its a regular occurrence during abstinence.
Do non-pois ED sufferers also get improvement in erection quality from abstinence? Do healthy non-pois non-ed men also see this improvement?
I truly cannot remember what it was like before I got pois. Is it normal in healthy men? If so what's the physiological process behind it?
What do you all reckon?