Well, 4 times a day is a lot, though it shouldn't cause harm.
I'm guessing you feel really anxious about this, which will only make things worse. If we weren't in the middle of a pandemic, I'd tell you to go to the doctor, but since we are, give it a week (with some exceptions I'll list below). Keep yourself busy. Exercise as you normally do, go for walks, play video games - distract yourself.
See if you get an erection naturally at any time. Maybe you'll wake with one, or you'll find yourself aroused by something, and it will just happen, with the stress taken out of it.
If it doesn't happen, try masturbating, and see if you get an erection. If you don't, then call your doctor. Not getting an erection can indicate other health problems, especially in someone your age.
During this week, if you notice any pain, discharge, swelling, chest pain - anything out of the ordinary, call your doctor immediately. Erectile dysfunction can sometimes indicate things like infection, heart issues, and other serious problems, so if you get any other symptoms, call your doctor at once, and mention that you also can't get an erection. It might be stress, a routine change being in isolation, low testosterone, or something else equally simple, so don't freak out, just be aware.
4 times a day!! I think your poor Old Man is needing a rest Mate. Once a day if you're young. Wait til you hit 45-50 years old. That's when the wheels start falling off. I think you just over done things and need to make it a special thing instead of an all day, every day thing. You're probably getting a little bored in your head somewhere.
You're panicking, and while I understand why, it's too early to panic.
If this is still happening, it's time to call your doctor. Sudden ED can indicate other problems, like heart disease, so you'll want to get that checked out promptly.
Sounds like you have an addiction to masturbation. 4x a day for 6/7 days straight is a more intense boot camp than the male pornstar with the most endurance on the globe puts himself through.
I recommend go for a week without doing it. If you can’t go that long try to abstain from little jimmy as many days/hours as you can. Then try again but make sure you’re hydrated, well rested but exercised well have some good lotion and the hottest scene you can find. Search for it for a good while & make sure that it is 1st place for your tastes. If you can’t make little jimmy puke then yes you will know that there is perhaps something medical going on & you can begin the steps to consult a doctor. On your 8th day make sure you’re not taking any medication or recreational drugs or alcohol that could possibly cause this.