I don't recommend weed as anti-depressant at this stage.... Its a downer. Weed can further depression or even bring on new symptoms if overdone. Please don't try weed as a first alternative, maybe later on in the process; when in a better state of mind.
St Johns Wort can be bought at holland and barrots and is highly used around the UK and States. It isn't anything dramatic and as I said purchased online or shop counter its perfectly safe.