Nausea before period?

Ok so last 3 months I’ve felt incredibly groggy week before my period, I’m 25 and this has only just started so thought nothing of it and put it down to working too much

Happened again this week and realised my period is due this weekend it’s always been a week before

I phoned my doctor and asked if it’s normal because I’ve never experienced it and he said it’s not and I should come in?

I’d rather get advice from here first

I feel hungry in the mornings and about 2 hours after I’ve eaten I feel nauseated all day, starting to drive me insane

(No I’m not pregnant)