Lyrica should not be mixed with any sort of Benzo as the two together double your anxiety as well as your risks of fits. It is also affecting the neurotransmitters in your brain that are probably adding to the depression and slightly delusional thoughts regarding your girlfriend [please, I do not mean that offfensively. It is just how the brain works]
Everytime I went into rehab they would always try to tale me off Benzos AND Opiates with no positive result because a benzo detox is much more harsh mentally as it is a psychotropic drug as opossed to opiate or opiod. So you get the physical harshness and the mental strain.
*this is my experience. Others may differ* Being a clinical psychologist helps since I usually got my benzos back

3mg is quite a low dose and why you are feeling it so heavily. As mentioned in an above post, taper off slowly and do so in three day intervals allowing yourself a bit of comfort rather than beating them out of you. It is natural as an addict to chase the original sedation you once felt making it even more difficult and the added use of psychedellic drugs depending on LT damage may draw your detox out further.
Another suggestion given was to go into hospital which may not be a bad idea, but I would suggest you say you are on a bit higher of a dose than 3mg since they do not detox for much less than that. I agree that may not be sound advice, but at least you will be comfortable and in a controlled enviroment.
Sod your G/F and worry about yourself. You are far too young to end up like some of us dinosuars on here in and out of rehab your whole life.
I do wish you well and hope that I or anyone else on this board has been of assistance.
MR