@sandalwood65
Unfortunately, you have multiple autoimmune diseases that are contributing. Dysautonomia along with Raynaud's can be causing vasoconstriction, chills and loss of temperature regulation mechanisms in the body. You may want to see a neurologist to get checked for dysautonomia. However, main treatments are still immunosuppressive drugs for RA and PSA plus calcium channel blockers for Raynaud's. Your neurologist may be able to offer some steroids. Beta-blockers are known to work for arrythmias, if you have abnormal heart rhythm.

Dysautonomia causes a wide range of symptoms due to dysfunction of the autonomic nervous system, affecting heart rate, blood pressure, digestion, temperature regulation, and more.
General Symptom Categories
Dysautonomia can impact multiple body systems, leading to diverse and sometimes unpredictable symptoms. Common manifestations include:

Cardiovascular: Rapid or slow heart rate (tachycardia or bradycardia), irregular heart rhythms (arrhythmias), low or unstable blood pressure, fainting or lightheadedness, especially when standing (orthostatic intolerance)
clevelandclinic.org
clevelandclinic.org
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Neurological: Brain fog, difficulty concentrating, migraines, dizziness, balance problems, and fatigue
clevelandclinic.org
clevelandclinic.org
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Gastrointestinal: Nausea, vomiting, constipation, diarrhea, and difficulty swallowing (dysphagia)
clevelandclinic.org
clevelandclinic.org
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Respiratory: Shortness of breath or exercise intolerance
clevelandclinic.org
clevelandclinic.org
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Urinary and Sexual: Frequent urination, urinary incontinence, and sexual dysfunction