My personal opinion is that you may have a bad trip, a very bad trip. Focalin is a very desperate decision because stimulants will make you unable to pass out or die and you will feel all the spectrum of propranolol and seroquel overdose. To be honest, stimulants are the worst thing to OD with. Seroquel is not lethal in such amount and propranolol - who knows, there is no certain LD-50. So likely all these 3 will add up and it will be an "unforgettable" experience.