Gas and acidity can cause discomfort and an internal chill-like sensation, but persistent chills and severe sleep disturbance should not be assumed to be only acidity.
I would check your vitals, CBC,
thyroid, blood
sugar and medicines, and assess anxiety/sleep as well. Seek urgent care for chest pain, breathlessness, faintness or high fever.
Meanwhile avoid late meals, caffeine, alcohol and very spicy/fatty foods; do not self-medicate long term.
Please book a Practo consult with me or visit Synergy Miraj for an examination and proper treatment plan.