Thanks for your query.Based on the facts that you have posted it appears that you have developed what is called as Phimosis
due to long standing infection of Glans of the Penis (Ballanitis)The only treatment option for this is to get circumcised.Please consult qualified Urologist
or General surgeon
for clinical examination and further treatment.
He will carry out the surgery(Circumcision
) under local anaesthesia .This will solve your problem permanently,