for about 1 week i have been having extreme dizzy spells during the day and at night and i was never prone to them,i was up all night last night cause if i layed down it felt like my head was going to explode from pressure and spinning.i also feel like my heart is gonna stop and i wake up just about everyday with 1 or more limbs asleep even if i know for a fact i did not lay on the them or have them in an awkward position.could this be anxiety?