is it safe to take Amoxycillin after finishing off trimethoprim tablets a week before?

It should be fine for you to take the antibiotic one week after the other. I hope that you do check in with your physician or a pharmacist just to confirm, because I don't have enough medical training to help! ALso, getting on a plane with an ear infection isn't totally advisable. I have been on planes with sinus problems before and it is incredibly painful. Hopefully your issue will have cleared up by that time. Keep us posted, okay?

I ended up with a rash etc. allergic reaction --- after doing this. Now I'm allergic to penicillian, where as I wasn't before.