My dog is on Furosemide. He usually drinks a lot

My dog is on Furosemide. He usually drinks a lot of water shorty after I give him his dose. Tonight he appears very anxious, nervous, his head is constantly moving from left to right, or he sits looking Fixated at one spot . These appear to be neurological symptoms. Are there neuralgical side affects to this drug? He also refuses water which he normally drinks in large quantiles after his dose.

I cannot afford to take him to an emergency clinic tonight. I can bring him to my vet tomorrow so I would appreciate any feedback.

Thank you

Anastasia Lynch