Am taking levocetirizine 5mg ev. day...and montelukast 10mg, ev. day...for the past 2-3 mos...experiencing strong numbness in hands and arms in the EARLY hours of the morning - some occasional mumbness during the day. Age 63, NON-diabetic, non-smoker, non-drinker. Only other prescription medication is Toprol, 50mg morning and evening to control heart rate. Could one or a combination of the above be causing my numbness?