Depression is really a bugger. But, since your thyroid levels were so low, that makes me suspicious that you case is more linked to that then the just plain-old-depression.
I would discuss what your treatment plan should be with the doctor, but I bet that when you get firmly established on the thyroid, that you will be able to come off the antidepressant.
Now, there is no guarantee...I am sure that you have heard from mental health workers that there are basically three types of people with depression: 1) those who have an episode, that get help and never have any problem with it again; 2) those who have an episode, get treatment, and then sometime later (sometimes years) have another episode (or more) and need treatment again; and, 3) those who have depression and need to be in/on treatment for the rest of their lives. It would be similar to diabetics, needing insulin for the rest of their lives because they don't make it for themselves any more.
Personally, I think the key is early treatment, follow the doc's advice and use what you can to work with this.
I really personally strongly dislike the term mental illness, but I have to live with it. I have learned that my anxiety becomes pronounced when something is bothering me and I keep myself so busy that I ignore it. I think that sometimes we think if we ignore something, it will go away--or we will develop a different attitude about it. Sometimes it can be something that we may not recognize as a problem, because we bury the significants the situation holds for us.
Nursing is a high stress job. Being in school is high stress. Having your boyfriend move in is high stress. Having health problems (low thyroid) is also stressful. Things probably feel a bit out of control right now. These things all set the ground work for depression, anxiety and all of that.
Simplify. See what you can do in your life that will make your life calmer. Being in school and working for your nursing degree is time consuming and lots of times, people in your life may not appreciate what you must do to stay on top of your game. Quit stressing yourself out with unreachable expectations.
When I was your age, I thought that I had to do every thing perfect. Nursing is a very important field. You are not just there making a pay check, people rely on you to take care of them when they can't. I was far from perfect, and when I would mess up, I would be really hard on myself. It was unreasonable.
So, what can you do in your life to make things less stressful. Yes, I think using the medications and not worry about the issues surrounding the medications will be a start.
One day, while I was in group therapy, one of the ladies said that she suffered from very, very, very low self esteem. It just struck me funny. We never just have esteem problems, we have to have very very very low self esteem...somehow it makes things sound so much worse, doesn't it. Like its a fatal disease. I mean don't we feel really, really sorry for someone with very very very low self esteem? I think at that time, I may have had some sympathy, but not today. Low self-esteem is not a fatal disease. I firmly believe that we can learn to honor ourselves--and do what is right for ourselves.
So, depression is a tool. It tells us that we are NOT listening to ourselves. We can face it, and use it to our advantage or we can let it defeat us and hide under the covers for days at a time or we can listen to it and grow.
Your struggles will help you be a more insiteful (sp) nurse.