Hopefully you are already feeling better! Sounds like you have a combination of dehydration and electrolyte imbalance...drink plenty of water and drink electrolyte solution. This is a danger of 'too much laxative'...and you may have been slightly dehydrated from the cold/flu to begin with.
Also, stay away from Tylenol...it's rough on the liver. For difficulty sleeping try valerian root and/or 5HTP.