I m a 61 yo female, with history of asthma (over 30 years). Recently, after a severe asthma attack & ICU stay, developed Meniere s Diease - vertigo, tinnitus etc. Prescribed B12 (500 mcg) and Betahistine (Betanor - 24 mg) per day. On medication for 10 weeks plus. Over the last week, having runny nose, sneezing , general tiredness and frequent bowel (5 x per day or more) movements. Stool is firm.Is this a) contra-indication of use of meds - B12 & Betanor b) a chemical reaction to use with NEULIN 250mg SR c) am i just paranoid? Thank you.