During sinus perforation take the medications very carefully as prescribed by your dentist. Try drinking as much of liquid/water as possible and avoid using straw while drinking and if you are a smoker than stop smoking as it will decelerate the healing process and if the problem still persists than you should plan a re-visit to the dentist.

Dont worry regarding the bristles...they can be due to trauma caused while tooth extraction. You din't feel that time as you were numb. this will automatically go away , you just wait for 2 weeks....Regarding herpes, it can only be type I herpes if you had an history of cold sores otherwise no need to worry and chicken pox blisters appear all over the body not inside the mouth...

You do warm saline gargles and take care of oral hygiene and avoid eating spicy food....for more info on sinus infection you can visit the link....http://www.identalhub.com/dental-complications-during-tooth-extraction-880.aspx