I have a sort of social death wish?

I run a small online business making custom parts. But i go through phases where i fail to reply to customers but although this badly annoys potential customers i still cant help myself for doing it.

I will also do this with friends just cutting communication with them until there is no more contact

I am not a drug user and just a mild social drinker and am a non smoker.

I have been to see my local practitioner but apart from happy pills she did not offer any help

I have a sort of social death wish is the only way i can describe it.

I would appreciate it if you can offer info on what is wrong and how i can combat it.

Thanks