I feel like I used to be able to cope with my bipolar but now seem to be dependent on my meds- is this normal?

Yes. The illness may b more severe but also u r becoming more aware of your meds & how they affect u.
Maybe. Bipolar has an undulating (up & down) course. Sometimes meds work better than other times. Many factors can influence effectiveness including sleep, nutrition, exercise, drug, tobacco and alcohol use. Intercurrent illnesses also play a role in how you respond to the meds. Check in with your doctor to discuss these variables.