Definitely, as soon as you can. It could have been a stroke, lethargy and a lack of coordination are key symptoms. If he's falling from things in his cage then either take the down or place some large hammocks in the cage to catch him if he falls. Hope everything turns out okay.
This page has some info on nursing for stroke (if that is the cause here) until you can get to the vet. I'm not a profession by any means so i could be completely wrong but just do your best to keep on eye on him and make him comfortable, make sure he doesn't have to climb to get to food and water ect... Good luck at the vet
Could also be a pituitary tumour as they lose the ability to grip with their front paws. That would be more likely than stroke if he has gone downhill a bit lately. Stroke tends to be sudden with no obvious signs before. Good luck, hope he's ok. He's very young for it to be PT but we've had it in a 14 month old.
The vet says it's like a sinus infection. He is on bytril and eating Oxbow Critical Care from the vet. She says if he is not better on 48 hours to do X-rays. But after two doses of his medicine I see improvement. Also I am in the process of doing a deep clean to their cage and room to make sure he does get sick again.
Thank you for your support everyone, it really meant a lot to me.