I have no idea whether I'm developing a problem, have one already or I'm totally ok..

I've had a difficult time in the past year.

Was diagnosed with clinical depression. Self harmed a lot last summer. Things escalated. I overdosed a few times between early January and December.

I'm in limbo. I see a psychiatrist at the moment. Waiting for something to happen/to get help. Nothings happening at the moment. Medication isn't an option for me.

I'm getting by by either taking legal highs, drinking or self haring each night. I can't go a night without doing at least one of these. If I drink, I drink one to two bottles of white wine, at 12/13%. I'm 5ft4, 21 year old female. About 10 stone.
If I take legals, I drop at least one pill a night. They're pretty strong.

In the past week I've had at least a bottle of wine a night. The week before that I dropped a pill every 12 hours. I'm running out of money. I'm panicking. I have no money left. I don't know what to do. I need to buy this stuff.

Does this sound like a problem? Specifically the drink.drugs?

I've been doing this stuff for months now, but got by with self harm. I've sunk a bit recently, and as odd as it sounds, had no energy to self harm, so turned to drink.drugs instead.

Any advice is welcomed. I feel at a dead end again...

You are obviously self medicating for underlying issues. That only works for so long and then makes matters much worse.
Why is medication out of the question? You are already self medicating. If you need to buy this stuff and panicking when you can't then it is a problem.
Self medicating and trying to handle all this on my own didn't work out to well for me.

I don't know what to add to zinco's post, as I think the response hits the nail on the head & asks a pertinent question about why you can't take meds. While it's up to you to decide if you have a drinking problem, I'd be concerned if I were drinking as much as you are. In addition to causing all kinds of other problems, alcohol loosens our inhibitions. Are you sure there's no connection between your drinking sprees & your SI? Just a question...