I'm so depressed

Hi I'm new here. I care for my husband of nearly 20 years who has a chronic illness and anxiety and depression. The problem is I'm so unhappy and depressed. I stay in bed all of the days there are no appointments because depression makes it hard to get up. I'm unhappy in my relationship also, I don't love him anymore. I'm already on the highest dose of antidepressants and I don't know what to do. I feel trapped because I feel I can't leave for many reasons 1 He needs me to be his carer 2 I have nowhere to go because I can't afford to pay for rent somewhere else, I'm on a pension 3 Leaving would be so hard emotionally, I've had a traumatic childhood and leaving leads to severe trauma where I have needed to be hospitalized. 4 i have no support, no friends or family that will help me. 5 i don't have the courage to leave, it causes panic attacks. Everyday is a struggle trying to work out how to cope. I'm not able to leave but I'm so unhappy. I'm trapped by my circumstances and by my emotions. All I want is to find some peace. I have no hope. I don't think anyone can help