dear friend thanx for sharing your concern to us.
first trust me its nothing grave for which you need to cry .nowjust understand that the teeth in our upper jaw have roots which are very close to the maxillary sinus
, so smtimes the infection in the teeth goes to the sinus as well and vice versa.
now i would also suggest you that plz continue with your antibiotics and analgesics.that will surely help you .
meanwhile go for xrays ,one opg for your teeth and a second one for your sinus that is water:s view.
after that it will be very clear to you and accordingly it can be managed.
if required rct can be done for the tooth and simultaneous sinus drainage
can be carried out.
all the symptoms you mentioned are related to this only.so donot worry and take care