Look mate, its not the end of the world. I'd hazard a guess your mum is resilient. I've discussed my own depression with my mother, had arguments and upset her on numerous occasions. If she's a healthy person she will bounce back fine. But yeah, mums are usually right with their advice, so give her a chance.

The other thing is, if you don't want to take medication I personally think that is your right. There is more than one way to skin a cat. Medication is a viable and worthwhile route, but its not necessarily the only route either. Still, seeing a GP is a good idea, they can run some bloods, organise referrals and discuss medications. Depression can be overcome.