My dear sister in Christ, I know exactly what you are going through. I, too, suffer from an emotional/mental disorder called depression/anxiety. The disorders are often co-morbid and can present problems when the illness is not taken care of. I've tried several times to come off the medication because many of the religious orders I was in contact with told me that I would have to be off it for at least 1-3 years before they would consider me as a candidate for religious life. However, it was not a good experience for me. I would be OK for about a year and then have a relapse and I would have to go back on the medication, which is exactly what happened this past year. I am back on a dose of anti-depressants and I am happy to say that I have been symptom-free for several months.
When I had to go back on my medication, I thought that I should not be discerning religious life because I had such awful experiences from orders that were not sympathetic to people like me. They believed that if I had an illness, there was no way I could have a vocation, and for a while (August 2010-March 2011) I believed them and suppressed the desire in my heart to try to lead a secular life while still being involved in the Church. I considered other vocations like the consecrated life of a virgin or marriage, but I eventually found that neither of these vocations brought me joy when I thought about them. I thought I was destined to remain single for the rest of my life.
My new parish priest has been a big promoter of vocations in our parish and has invited a religious order of Sisters and a friar to our Church for discussions. The first time I heard the Sisters, I had a desire again to be one, but I dismissed it as a coincidence and thought it would go away in time. But when the friar came, the desire grew even deeper and I felt like my heart would jump out of my chest when I saw how devoted to God he was and how much joy he possessed by serving Him. I desired to possess that joy myself.
I am an active member on another forum called Phatmass and we have a Vocation forum there. There has been talk of the religious order called Religious Sisters of Mercy in Alma, MI. One young woman has become a candidate and is entering on August 1. The greatest inspiration for me is that she, too, has a mental disorder and must be on medication for the rest of her life but the Sisters are accepting of her! When I spoke to her about the Sisters, I became overwhelmed with joy because I'd finally found an order to which I felt called to visit AND that was merciful to those with illnesses. She told me that because they have psychiatrists and psychologists as Sisters, they are much more understanding and have the resources to deal with these kinds of problems.