Hi, he need evaluation for proper diagnosis and management of his problems. Madturbation is not pathological and also difference inthe size of testicle is also normal. Only pathology from information mentioned is difficulty in erection and early ejaculation for which many good medication and therapies are available.
Next Steps
Consult Psychiatrist immediately for proper management as they are the expert for these type of problems. You can also consult me at my Green Park, Delhi clinic. Thanks...