Hey dude, Just to clear a few things up here a professionally made occlusal splint (aka night guard) that puts your jaw joint into the neutral position (not just props it open) is a must for you. Also most research and proven success is on splints that cover a full arch, not a partial arch coverage which some dentists prefer in fads. The idea is that you grind your splint to bits rather than your teeth, I'm sure this is pretty obvious.
There are hard splints, soft splints and laminated hard/soft splints. Many patients find the soft and laminated more comfortable at first but if you ask the ones wearing the hard splints how they find it they almost always say they find it no probs, took a bit of getting use to. The key is that the bite is adjusted correctly when it is issued to you, not just impressions taken, the splint made and issued to you without adjusting the bite.
Also over time the hard splint is much easier to keep clean and therefore more hygienic.
Botox injections are quite topical at the moment with very limited indications. It is most definitely not something to try without first trying a splint and secondly consulting a Maxillofacial Surgeon.
PS the habitual side of this condition is almost impossible to change/correct. Unless it was brought on by some acute definable stressful stimulus, then eliminating this may correct it. Learning to minimise the effects of the gridning is therefore the most important key in management