Many blessings are raining down upon you!
I rarely get non-MS problems. Colds and flu have never bothered me. I did have a bacterial pneumonia I contracted while in Indonesia in '94. I have had my annual flu shots (never got an H1N1) every year since just to make sure. I battle my MS daily, but the rest of the problems, none. I consider that to be a blessing itself.
Fish and certain nuts (Black Walnut for example) are the best sources for Omega. You can take the supplements. If you do not like fish, I might suggest a Chinese, Japanese, or Indonesia fish meal.
Omega 6 is the easiest to supplement via foods, but Omega 3 is not as readily obtained.
Flax has 20.3 grams Omega 3/100 gram serving and 4.9 grams Omega 6/100 gram serving.
Salmon has 3.2 grams Omega 3/100 gram serving and 0.7 grams Omega 6/100 gram serving.
Walnuts have 3.0 grams Omega 3/100 gram serving and 30.6 grams Omega 6/100 gram serving.
There are Omega source food lists online or via your dietitian or nurse.
Congratulations on making some well needed car progress!