Not sure a LP is "horrible". I had some major discomfort for maybe one second as the needle was pushed all the way in, but there was no discomfort at all after that, other than having to laying on my side with me knees drawn up, and then lying flat on my back for 2 hours following the procedure.
Some doctors can do LPs that are nearly painless I have heard. You may wish to inquire about getting one of those. LPs aren't fun, but there are other things that are worse. I had a cortisone injection in my foot once - now that really hurt and it hurt for more than one second!
You just have to do what you have to do. I hope it turns out not to be MS and something the doctors can do something about. But, for now, be sure to get on a good MS diet and start taking the various MS supplements, i.e. Vit D3, Magnesium, Zinc, Malic Acid, Vit E, etc.
Best of luck.