Hi Hazel, and welcome to the site
Some of those questions are tricky to answer without writing an essay, but I’ll do what I can.
1: DMDs (disease modifying drugs) come in pills, injections and infusions. If you have a look on the msdecisions website, you can read all about them. The DMDs that are normally prescribed for new people are injections. If these don’t work, then people are switched to the pills or infusions which are stronger drugs (and therefore have stronger potential side effects). Please don’t worry about injecting - easy to say of course, and I can’t imagine that there are many people who don’t freak out at least a bit before they do it - it is honestly MUCH easier than you could ever imagine and there are some excellent autoinjector gadgets these days that can mean that you don’t even see the needle.
2: MS doesn’t really have levels. There are different types, but all of these can vary from very mild to very severe. Given that your neuro is putting you onto a DMD, it is almost certain that you have RRMS (relapsing remitting MS). This is the type of MS that can respond to DMDs. The injectable DMDs don’t help the progressive type of MS.
3: Are you asking about nerve conduction tests? If yes, then different conditions give different results. In MS, nerves can be slower to respond because their myelin coating has been damaged by the immune system. (Myelin helps nerve signals to travel fast. “Demyelination”, damaging / removing myelin, is a key process in MS.) This sometimes shows up in nerve conduction tests.
4: There are no dos and don’ts with MS. There are things that are recommended though: taking a hefty vitamin D3 supplement (a lot of us take 5,000iu a day - Healthy Origins are cheap on amazon if you want to get some), keeping fit, stretching, eating a healthy diet, not smoking (smoking is known to be bad for MS), avoid overheating (makes symptoms worse temporarily) and, if you suffer from fatigue, resting before you get tired and pacing yourself. I’ve probably forgotten something(s), but it’s all common sense really: keep as healthy as you can and don’t overdo it + take vit D3.
If you want to learn more about MS, I recommend sticking to the publications that you can download from this website and the MS Trust website: there are a lot of crackpots out there and it’s easy to get taken in if you are still learning! There are no miracle cures for MS and anyone asking for money for something that will help MS is probably scamming When you’re reading, please remember that MS is massively variable, but that these booklets have to cover every possibility. That means that no one gets everything that’s mentioned in the booklets!
Everything is quite overwhelming in the beginning, but I promise that it does get easier. Getting the diagnosis is a horrible scare and a complete shock, but MS really isn’t the end of the world. People with MS can still live long, happy and fulfilled lives. And life really can still be good.