I cant seem to get my 4 Optifast in daily

This is day 3 on optifast and I haven't been able to get all 4 servings of optifast.  Is it okay if I only have the 3 and my veggies, or should I force myself to have all 4? 

Call your surgeon's office and ask.

Are you not hungry? Or is it the taste?

Check with your dr - some optifasts only have 14 gm of protein.  3 of them is 42 grams a day - so you would be going into surgery with several days of low protein.   60-80 grams a day is minimum recommended.  I shoot for 80-100 gms a day.

PS While I'm glad you asked here - being able to follow your surgeon's directions is really important - including working through issues as they arise.  Someone is asking about is it the taste or are you not hungry.  That is good to think about - so you can comply with directions.