What Causes Unusual Patterns In Vision, Hand Tremor And Speech Disorder?

Question: I see patterns which are not there usually on walls or the floor, they can be shapes ( squares or oblongs) and frequently are writing, not coherent sentences but some of the words are readable. I also see sometimes when walking outside sometimes see objects which look real from a distance ( eg a wire fence or a bicycle with no tires ) which do not exist. II does not affect my eyesight at least I don't think so . Onset of this `1 week.

Hands shake badly, not all the time but I have difficulty doing simple simple tasks such as buttoning shirts, . writing has not been possible for about 3 weeks and speech also zffected. These suymptons onset were concurremt with a severe flare up of an old back injury 3 weeks ago. Speech has now returned , simple tasks wit hands have not. Some shaking has been apparent for several years but speech and other issues are new, onset at time of back flare up. Seeing phantoms objects shapes patterns and people. as well as halluncinations at night, are new onset about 1 week.
medications include revlimid for myeloma, carbodopa levodopa for shaking for Parkinson ( parkinsons is now thought not to be the cause) , ambien for sleep. I am not diabetic. Health generally good
I would appreciate any input you may have on these issues.
My best
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