Can constant texting and typing make your handwriting worse if you dont do it anymore? mine is worse than it used to be. sign of ms? i feel like its hard to write certain words now?

It could be carpal tunnel syndrome. Use a brace and do simple exercises.

It is probably lack of practice and losing fine skills involved in writing, unfortunately another long term side effect of the powerful electronic revolution. However if your fingers feel numb or stiff, inflammation as seen in rheumatoid arthritis or a neurologic disease (through apraxia) may need to be ruled out and talking to your doc would be recommended.