Use crumbled oregano, and put/place where the infestation is. Bedbugs do not like the scent of oregano. This is a much healthier option than telephoning a bug exterminator to spray poison in your home. Actually being that it is winter now, maybe you could freeze the bedbugs in your home/apartment. This would require finding an alternative place to stay for few days, while the bedbugs are being cold killed.