Good that you reached out for different views.
1. "...my psychologist has been diagnosed with cancer and will be undergoing treatments. She has put her practice on hold for at least 3-6 months...."
2. "In the meantime, I'm not sure what to do about getting another psychologist."
3. "I have an appointment to see her partner, but that is not until late April...."
4. "Being bipolar, and having some serious family issues going on right now, I really need to talk to someone with an objective viewpoint."
5. "I have been doing pretty well controlling my depression taking lamictal and seeing my psychologist on a regular basis"
6. "but this event in the family has been a major negative trigger, and I can feel myself sliding in a direction I don't want to go.
7. I'm really lost right now, and I don't have a clear direction forward."
8. "Any thoughts, advice, suggestions - would be greatly appreciated. Taygeta"
Pretty tough situation. You don't really want to get hooked on a 2nd psychologist, then when your 1st one gets better, having to decide which one to go with.
I think you're going to have to think of yourself, and not the feelings of any of these psychologists, or your feelings about having to drop one of them.
I know it's tough, but what's even tougher is if you don't have a psychologist during these tough times.
I think it's better to have 2 psychologists, than none.
What do they say, "It's better to have (something) and not need it, than to need (something) and not have it."
That is, if you get out there in the middle of a situation and don't have a psychologist, that could be a problem.
But if you get out there in a situation and have two psychologists (One for now, one for several months from now), that's not as big of a problem.
Take the lesser problem, two psychologists. That's one level of thinking. Again, the other side of the problem is, no psychologist but perhaps big problems.
There could be a problem if you like both psychologists, but that's a lesser problem in degree from having no psychologist, but you've got anticipated problems, and ones you might not know about.
Prepare for the possible storm, not the possible fair weather.
You can find psychologists in the search engine by typing in "Real Yellow Pages for Your Home Town," then when those Yellow Pages come up on the screen, type in "psychologists for your hometown."
You can write down a few names, and call one. If that one doesn't work out, call another one.
That's just my thinking.