You can, you just need some medicines and rest to relieve this spasm, after that you can exercise. And it is normal as due to lack of physical activity, a lot of people have gained weight during this year. For more guidance take a paid instant consultation. Hope that helps. You can even consult directly via what sapp on 9999x104x408

You need further evaluation.Do consuptation with proper history.any thyroid issues?

Muscular spasm can be relive by neck excercise suggested by physiotherapist , change your life style, do yoga, pranayam,walk excercise,over anxiety,over thinking r also the causes of weight gain hence try to avoid