Pain in upper leg - groin

Hi everyone!

I'm relatively new here, so before I'll asked the question I'll introduce myself...
Right now I'm judoka 2nd kyu (blue belt), I do this awesome sport now for 7/8 years. For those who asks themselves why blue and no higher belt? -> I skipped my judoexams for 4 years, because I gave priorities to my studies. I'm 18 years old now.

Now my question: I skipped training for 3 months: vacation + I was graduating from highschool. The fourth training, at the end, after the randori, we did some cooling-down exercises, all fun, intensive training haha but I think I overstretched my leg, so now my upper leg and my groin (left and right) hurt... I have to tell, I just recovered from a (not so heavy) groin injury.

Walking up and down the stairs? Hurts.
Go sit on a chair: hurts
get up out the chair: hurts.

I've read some articles and I've seen some about 'quadriceps tendinitis' or something like that...
Anyone who has had the same injury?


Greetings!

How long has it hurt?
Can you see a trainer or physician?

It hurts for 4 days, now all good! But I wanted to hear of you guys/girls if you have had the same... I wanted to wait before seeing a doctor, if it's hurts tomorrow again, I'm going to see a doctor...