I wake up with my ears plugged up because i'm congested due to allergies. decongestants/stimulants make me jittery/shaky/anxious/high heart rate.

See an : Allergist. They can offer you treatment with fewer of the side effects that you describe.

Allergies: Rather than using decongestants which can cause side effects that you've noticed, try an antihistamine if you don't have any contraindications. Otc examples include Loratadine & diphenhydramine. Be sure to chat w/your family doc. Sometimes Normal Saline nasal sprays (not afrin or neosynephrine) & steroid nasal sprays can be useful. Also sinus flushes/washes, too.