upvoted and following You now,
been there done that!

I do SO recognize Your story and to be honest the problem is implicit in our selves,
this is who we are.
Maybe You already know but you are an empath.
It means You are a very sensitive person with a radar for other peoples emotions,
it goes automatic (without the bleep sound) that you pick up how strangers feel.
There are many groups on facebook for people who are emphatic to clairvoyant.
The tricks to deal with emotional vampires who drain your energy feeding off you
is to

1. time refrain them, only deal with them for a set time.
2. define your space, choose when to be in the room with them.
3. know You can lead a starving horse to water, but you can not force them to drink.
4. before hurting yourself getting cramps, dark feelings or migraine learn to use your
   love for yourself by finding a way of meditation that fits You.
5. maybe turn your ability into a (partime) profession asking an hourly rate at least
   the emotional vampire is not draining your wallet then.

sending You love and light,
Nic.