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Quick update - having been rendered unable to cope any longer with the level of pain I have experienced, I attended the hospital again this morning.
I saw a lady doctor who has sorted me out once and for all.
She advised me that the tooth had been infected before its extraction, a poorly completed root canal had caused long-term infection which caused the loss of the tooth. The infection had simply flared up again after the infection, and a spur of bone had pushed through the gum and rubbed on my tongue, developing an ulcer.
She has taken out the original four stitches, which she reckoned were put in too tightly, cleaned everything up inserted a dressing, and re-stitched it again and given me some anti-biotics to see off the infection.
I think I'd like to marry her!!!!!