Medications are tricky - they are not an instant cure. But you should go to your doctor and talk about the options you have to treat these symptoms (therapy and medication are two of them). You can also be tested to make sure there is no underlying physical cause - that's so very important!

For medication, your doctor will try a variety or them because they work different on different people. If you're super lucky you'll get the 'right' medication on the first try =) If not you'll be stuck trying out several until you find a good one. And a few people are resistant but this is much more rare. Sometimes the doctor will fine tune the medication(s) you're on by increasing/decreasing dose, or adding a new medication to the mix.

Medication relieves the symptoms of these things. If you have an anti-depressant that's working really well for you your mood will be pretty much back to normal after some time (it often takes weeks for the medication to fully sink in), or it might make you feel much better and more able to work on your feelings.

Regardless of the success of the medication, I don't think it will ever be like it never happened. In order for that you'd have to lose your memories. But it can help significantly. Therapy is also incredibly helpful to many people, and you should check this out in addition to asking about medications. Sometimes having medication AND seeing a therapist can be the best way of recovering.

Take care