My wife had a fall last week and hurt her knee and calf and was feeling guilty about going to A&E like yourself. She saw a Physio & had X-Rays and mentioned feeling guilty and the Physio said you’ve done the right thing, the clue is the first word of the title ACCIDENT!
So go and get it looked at.
I know it can be extremely painful as I have suffered with plantar fasciitis without the rupture and it is really painful.