I am sooo sorry to hear of your experience my dear.
Yes I do believe you used to much ACV with the pepper and salt. That amount of ACV with the pepper and salt can irritate the lips, because of the burning effect of both ACV and pepper..
Great recipe idea of a salad dressing, but next time use 1-2 parts of ACV.
But here are some helpful ACV salad dressing recipes you can try my dear ;)
If you have honey you can try putting honey on the swollen and peeling areas, it should help ease your pain and speed up your healing process..
It this doesn't work, please consult your physician.
All the best in speedy recovery.