Reduced effectiveness of Vyvanse with upcoming exams

Dear ADHD community,

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first time poster here, so please be kind and tell me if I do something wrong or if you need more information!

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I (39F) got diagnosed with ADHD (inattentive) earlier this year, wich was a huge relief. I started medication and behavioural therapy.

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At first I took Methylphenidat (half immediate, half extended release), but I didn't feel any different plus I had problems with increased heart rate so my doctor switched me to Vyvanse. First 30mg (which didn't do much), then 50mg wich suddenly did the trick!

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My problem now is, that after almost 3 months on Vyvanse 50mg I noticed that the positive effects reduced a lot. It is not like I do not feel any effects (I forgot to take the meds a few times and these days were even worse), but I feel like I have such a foggy brain and it takes so much energy to try and stay focused. The problem is, that I will have important exams in less than two weeks.

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Is there a short-term fix for this? Any experiences in similar situations?

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Important details:

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- I already called my doctors practice. They will be in touch later today or tomorrow. But I would love to hear about your experiences in similar circumstances! It might help me ask the right questions.

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- So far I did not take any days off. My doctor advised me to take it everyday. I do think this might not have been wise and the situation might have been preventable with days off of the meds. But right now I don't have the time to start this, as I have exams in less than two weeks... Wouldn't be a problem at all in the future, just not right now.

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Thank you all so much in advance!!

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Edit: I sleep well (about 7-8 hours per night), drink plenty and eat regularly (have a healthy breakfast before taking it, a protein-heavy light lunch and regular dinner, usually healthy). No change here in the last few weeks!