For one thing stop the Kratom. It's highly problematic in general but weight loss is a common side effect. General stimulation without energy reserves is also a common side effect leading to dizziness.
https://www.mayoclinic.org/diseases-conditions/prescription-drug-abuse/in-depth/kratom/art-20402171
For food try a Shooter's sandwich.
If you have use of an outlet for an hour or so before lunch rice cooker meals can make a great hot lunch that only needs to be plugged in before lunch.
What are plural systems?