I Have Been Prescribed Seroquel 300mg Hs. I Have Problems

I have been prescribed Seroquel 300mg hs. I have problems in the morning w feeling groggy, dizzy and fuzzy headed and sometimes lasts in 11am - noon. I have been only taking 1/3-1/2 tab hs, but this does not help me. I have also gained 50lb in the past 8 mths. I do NOT like these effects. I have been trying since March to get it an rx chg, but had various problems finding a dr. The dr I saw last wk rxed Latuda and its $250 per mth. I cant afford it. Is there something else comparable to these???