Can Morphine Be Taken With Anesthesia For Surgery?

hi am booked in for key hole surgry to remove my gall bladder,ave had a chest infecton for a week now,my gp prescribed amoxocillion 500mg 3 daily fo 5 days i started it tues,ave to get op on tues(5 days time) will i be well enough for surgery,am also on mst continus 15mg morn and 15mg at night will i be ok with the anisthetic with morphine,am really worried about this