Hi Rachel,
It's really important that you see your GP as soon as possible. Medications such as antidepressants must be weaned off gradually, as stopping them abruptly can cause side effects and emotional issues. If you don't have a GP you have seen regularly before, you could find a local clinic and make an appointment there. Your GP will assess whether you need to go back on your medication, try new meds, or make just lifestyle changes.
Lying, as you have discovered, can get you into some tricky situations. Try working out why you lie, and in what sorts of situations you tend to lie the most. If you get to the root cause and the emotions behind the lying, then I think you'll have a better chance of being able to put a stop to it. It sounds as if your lying has only, or mainly, been to your parents. You need to apologise and try your best to gain their trust back. Your parents will most likely forgive you, because family tend to do that, especially when it's clear a family member is struggling, and if they can tell you are genuinely sorry.
My main advice is to be honest and open with your parents. Choose a time when you and your parents are relaxed and not stressed for time, and explain how you're feeling and your concerns about them not trusting you. When they hear that you feel regret and really want to remedy the situation, I think they will want to help you and support you.
I can say with almost certainty that you haven't lost your parents. Go back home and talk to them as soon as possible.
Good luck with everything,
SM
