possible plateau??

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ok so when i first started on here i was doing awesome. at least losing a pound a week. then i got a major double inner and outer ear infection and couldn't eat the whole week. so i lost 3 lbs. that week. Ever since i got better i have been trying to go back to what i was doing. staying under my calories and exercising. well i have been going up a few pounds and then down and i just cant make it past these darn 11 lbs.... please someone help me. im getting really upset about this...