Internal tremors. weak legs and arms.

Hellow drs.my wife in march started having this internal tremors and vibrations for some days than they went away by itself.than in june she had them again for a month and they went away suddenly.than in September we came to know she was pregnant and the symptoms recurred again .she is currently 13 weeks pregnant her symptoms are now.lack of energy,weakness. Internal tremors and shaky ness daily.. We consulted some few drs and they told us to do thyroid tests which were normal.sugar was normal.the blood showed some incontinence so the dr suggested doing vit b12 test.which showed it was below normal.so the dr suggested 1000mcg injections once a week.which for now 2 month are very little ineffective. So another dr suggest neurotone/its like vitamin bcomplex.but no efects.she had pcos so the gyno suggested metformin and birthcontrol pills for getting pregnant.currently she is using neurotone,pregnacare,calmag zinc.folic acid.kindly help us what todo.as drs here are not able to help.thanku