I do not know what's going on,but u terribly need help

So,i had this boyfrnd of mine,we dated for like a year.

Everything was going good,we would spend hours together smiling and loving each hother's company.

Suddenly ,his family planned of shifting to a completely different city.

He didn't end the relationship,but since the day he has gone,

I have restless nights,

I can't concentrate on things,feel frustrated .I don't feel like waking up and going to office anymore.sometimes,my heartbeat rushes so fast and I start sweating ,and this scares me.

I feel so vulnerable.

I feel helpless and I feel lonely even admist the crowd.

I cry seeing the places we've been together.

I don't have a good professional life.

It's full of politics and that gives me stress too.

My mom taunts me everyday.

I scratch myself sometimes,beat myself with ruler sometimes, I do not know what is happening..but I need someone with the help of whom these can stop