I live alone with 2 cats also! I also love my cats, but you are right, it gets boring. I don't get out much either because of my depression, and often on the weekends, don't even bother dressing in anything other than sweats.
Changing job IS stressful, on top of everything else you are dealing with, yikes!
I don't have much advice ... along with my recently prescribed meds, I've made a habit though of taking a multi-vitamin, some extra vitamin B-12, flax seed oil pills and calcium every night. I hope that can help me somewhat .....
I totally hear you with the valium stuff. I don't want to take any medicine that's not necessary unless I am absolutely desparate for it!
I'm not fond of doctors either and have a basic mistrust of them -- sometimes my mistrust is unwarranted but I absolutely hate how most only spend about 8 minutes (if that) in the office with me. It makes me feel rushed from the beginning and I never remember to tell them everything I planned on (even if I bring a list ... ). The best doctor I ever went to was an oncologist while getting diagnosed for an autoimmune disease I have -- he actually talked to me in his office for about 20 minutes before poking and prodding and taking blood. Other doctors I've been to begin all that poking and prodding before I even tell them everything that's wrong!
Sorry I don't have much advice for you. I could be a hypocryte and tell you to exercise and watch your diet (unless you already do these things) but I don't do them myself very well!