Just upped my Ritalin LA 20 to 30mg. Also taking Zoloft (sertraline) 100mg. I feel tired and don't want to do anything, sadness feelings. Why am I not feeling btr?

Talk to your doctor . You might be experiencing side effects to your medication. Contact your doctor.
Too much ritalin (methylphenidate) Some people taking Ritalin (methylphenidate) can feel this way if the dose gets too high for them. Causes them to feel the blues. Talk to your prescriber about an alternative to Ritalin (methylphenidate).