Am I unstable or having a disorder?

I switch quickly from idealizing other people to devaluing them, feeling that the other person does not care enough, does not give enough, is not “there” enough. I can empathize with other people, but only with the expectation that the other person will “be there”. I can realize that there is a pattern of unstable intense relationships, such as idealizing someone one moment and then suddenly believing the person doesn't care enough or is cruel and switching to another quickly. Basically I love two women, truly & madly. I'd die for the both of them.Past 2 years I've been fluctuating between the two whenever I feel the above mentioned state kicks in. Also, I have isolated myself from my friends, not picking up their calls & I realy dont like to socialise or go out. Most of the time, I get angry unnecessarily & shout and then cool off soon. One time Im extremely emotional and the next moment i dont feel anything like im emotionaless. Please help me what I'm going through with!