Your description is that of sclerosing lymphangitis of the penis. This is an inflammation of lymph channels, usually located just behind the head of the penis and is thought to be related to vigorous sexual activity. It is self limiting, i.e., it goes away on its own and does not involve permanent damage. Just give it time to go away before traumatizing your penis further.
An anti-inflammatory drug such as ibuprofen (600 mg every 6 hours) if you do not have any contraindication to its use, may be helpful.
S.A.Liroff, M.D.