Current medical status: TTC for two years - been on clomid for eight months, pregnyl and another injection also been on duphastron,and a drug for friendly mucus had one tube unblocked
Current medical treatment: not having fertility treatment at present

According to the suggested diagnosis (“ high prolactin levels, uterus lining too thin, eggs not developing to the correct size, and unfriendly mucus”) you probably have an endocrine disorder that prevents ovulations, so conceiving may be impossible. One blocked tube is an additional factor that further contributes to your sterility problem. Doctors have given you ovulation stimulators but obviously the results were not satisfactory.

Stress might have a negative impact on your fertilization ability but I don't think that the stress is the main cause for your sterility.

Normalization of the cycles might indicate that your ovulation is established but you need proof i.e. detection of progesterone in the second phase of the cycle. If you establish the ovulations you can conceive naturally.