Thank you all for your words of encouragement, and for the advice and suggestions.
At this point, I honestly know I need a change, even if it will mean that my income level may decrease. If I interview for another job, I want to go in as an energetic, articulate, upbeat candidate without the defeatist attitude that Zapotee mentioned, and to do that I need a little breathing room from this job.
My plan is that, though I've been sending out applications sporadically, once I leave, job searching WILL become my "new" full time job. By leaving voluntarily I will not qualify for unemployment-while I'm unhappy with my company and work environment, it definitely doesn't meet the state's qualifications for a quitting for good cause; however, I have enough saved (especially considering that B. and I split expenses) where I will be okay if I do not have another job for a long time. I am also prepared to take a "day job" that would provide income while I am searching (a retail or barista gig?), or an entry level position in a good company where I could eventually work my way up (Nordstrom?) I know I need a plan to create structure to my day - scheduling time for job search activities and time to work out on a daily basis - to avoid a downfall.
In terms of health insurance, technically I *could* purchase domestic partner insurance through B's company; however, it would be quite expensive (not quite as high as COBRA would cost, but close.) Instead, what I am looking into is purchasing individual high-deductible health insurance, preferably with a HSA plan, and have been researching some of the options that would be available in my state. It would not provide great coverage for regular expenses, but would be a LOT better than nothing if anything catastrophic ever occurred. My main ongoing medical costs involve prescriptions - 3 meds, all of which are generic and inexpensive, and two of which cost $4/month. I'm planning to schedule any regular medical appointments (at the dentist, eye doctor, and general physician) as soon as possible so that I can get them taken care of before I leave, and ideally even before I give notice.
I am very hopeful that, even if I don't find my *ideal* job right away, at least I will be able to make positive steps to move into a healthier work environment where there is some long-term growth potential. I am so grateful that my partner, family, and friends are in support, and I include YLF in that group. Thank you so much for caring and for offering help, even if it is simply "being here" in a virtual environment.