Hi,
Im sorry to her you had such a bad experience with Ritalin. I know with a couple of medications doctors ordered for me I had very vivid dreams not so much scary.

You must be seeing a neurologist for other symptoms your having. There may be something else going on.
Don't be afraid to tell your doctor your complete history. He won't be able to provide appropriate treatment unless your open and honest with him.

Not having a good nights sleep only makes ADHD worse. Maybe he can give you something to help with sleep untill your symptoms are stabilized .
Explain to your doctor the experience you had taking Ritalin and ask what other options you have. If a doctor will only prescribe a drug that you have already had a bad experience with, then you need a different doctor.

There are many drugs to treat ADHD in adults. Stimulants and non stimulants. Along with alternative treatments.
Stimulants like Methylphenidate is the active ingredient in Ritalin, Concerta and other drugs and amphetamine the active ingredient in Adderall, Vyvanse and other drugs such as Dextroamphetamine ( one of the older drugs ).

The more I learned about ADHD and how it was effecting me and my life was my first step . I found a combination of medication, Behavioral Therapy, relaxation techniques and meditation to help me the most.

I know how difficult it is living with ADHD. It's so hard to be patient and find the right combination that works for you, especialy when you feel like everything is out of control.

I take Dextroamphetamine Extended release caps and sleep great. That's not to say you would have the same response.
Not being able to take my regular dosage because of the shortage has been a major struggle for me in many ways. After writting my post earlier today I realized it took me almost 2 hours to complete.

With the current shortage of drugs make sure what ever is prescribed is easily available.

I wish you the best of luck finding what works for you.
One step at a time....... Take care of yourself ~