Titrating up or not? Stalling with side effects

I am at the 4th week on 2.5 mg since I have started. I lost 3kg in the first week only and from week 2 I have been stalling and gained back 1 kg now in the 4th week.

I have been experiencing nausea, headache and sulfur burps.

Should I titrate up to 5mg?

I am concerned about the side effects might get worse and impair me with my job and singing career.

And I have been dealing with PCOS since I was 14 yo.

I forgot to say I have drastically reduced my calories intake.

Thank you very for advising and sharing your personal experience 🙏🏼