Toprol-XL and heart doctor

My heart doctor had put me on toprol xl for my heart arrhythmia but I was also having really bad dizzy spells and feeling like I want to pass out before the toprol.I did pretty good on it for a good while.then out of no where the dizzy speels started back up and feeling like I want to pass out.Had all the other tests and nothing abnormal was found.But I'm still having the same problems.I had done an oxymeter test and found that I was only getting 79% oxygen to my brain.Then was put on an oxygen concentrator.It worked for a short time but the symptoms came back.So I called the doctor Friday to see if I could quit taking the toprol.They you can't quit cold turkey cause you could have a heart attack.That's scary..And I'm a 44 year old female.I'm not quite ready to go just yet.Especially from quitting a medicine.

was put on toprol 25mgs. one year ago by my heart doctor, for tachycardia which only happened after stress. soon thereafter i developed a numbness in the toes of both feet. i saw my my intrenist who didnt know what it was from. i left the country and was livinf abroad until aug 07. while ther the paresthesia of my toes got worse and started traveling up my foot and half of my calf. saw my internist and was advised to see a neurolgist. he put me thru a series of blood test and an emg. all came up negative. went back to the internist and asked her to review my records from sept 2006. first thing she noticed was that i had been started on toprol. she told me one of the side effects is paresthesia of the feet and or hands, and advised me to cut the dose in half for a few weeks and then in half again in a effort to wean me off of it. its been only 3 days since i began to cut down and already the numbness is starting to decrease. has any one else experienced this? does it go entirely away? please write. hopefull