It could do that, especially if you had an unusual allergy to cat fur or dander or some other sensitivity to them. The absence of that in the atmosphere could change your chemistry somewhat very easily.

Strange, but bipolar patients can have sensitivities like no other group of people. (Many psychotropic medications contain an antihistamine in them.)

You could push it by seeing an allergist and undergoing testing, but if you're better, I wouldn't think you'd need to do that, but I'd be careful before I decided to get another cat.

My sister and I both are so allergic to them it's not even funny. She was given a small white Persian kitten as a young child, and on the way home from a trip to get the kitten, Mom and Dad had to stop and give the little animal away because my sister's symptoms were so bad. She can't be in the presence of one; I have a different reaction but am still allergic to them, though I've never owned a cat and didn't even know I was allergic to them until allergy testing revealed it.

Not enough is known about how things affect the bipolar mind at this point, but you can be sure that many, many things can affect feeling tone in bipolar illness. I have an inherited allergy gene in addition to Bipolar II and know that these things are very real and disturb feeling tone like nothing else can.

I hope you get along well and remain free from symptoms.

Take care.