My mother (86yo) had 3 of her parathyroids removed a few years ago and is having problems stabilizing?

Hello – my mother (86yo) had 3 of her parathyroids removed a few years ago and is having problems stabilizing. She is extremely tired and visibly shaky. She is currently taking 5mg of Calcitrate in the a.m and 5 mg in the p.m. She also takes 3 Tums a day and 400 mg of Magnesium daily.

I have included her test results below. Her endocrinologist has stated he is satisfied with her calcium levels and there’s no cause for concern. She is scheduled to get a second opinion on July 16th.

Any information or direction you can provide will be MOST appreciated…thank you for your time.

6.3 pg/mL (Low)
Date: Jun 09, 2018 10:42 a.m. EDT
Reference Range:18.4 pg/mL – 80.1 pg/mL

< 5.5 pg/mL (Low) Date: Jan 13, 2016 10:08 a.m. EST Reference Range:14.0 pg/mL - 72.0 pg/mL 6.0 pg/mL (Low) Date: Nov 19, 2015 07:33 a.m. EST Reference Range:14.0 pg/mL - 72.0 pg/mL 7.0 pg/mL (Low) Date: Oct 28, 2015 09:37 a.m. EDT Reference Range:14.0 pg/mL - 72.0 pg/mL 10.0 pg/mL (Low) Date: Oct 15, 2015 10:13 a.m. EDT Reference Range:14.0 pg/mL - 72.0 pg/mL < 5.5 pg/mL (Low) Date: Sep 22, 2015 11:15 a.m. EDT Reference Range:14.0 pg/mL - 72.0 pg/mL < 5.5 pg/mL (Low) Date: Jul 08, 2015 11:05 a.m. EDT Reference Range:14.0 pg/mL - 72.0 pg/mL < 5.5 pg/mL (Low) Date: Feb 11, 2015 06:06 a.m. EST Reference Range:14.0 pg/mL - 72.0 pg/mL < 5.5 pg/mL (Low) Date: Feb 05, 2015 03:10 a.m. EST Date: Jan 06, 2015 11:50 a.m. EST Reference Range:14.0 pg/mL - 72.0 pg/mL 132.0 pg/mL (High) Date: Jan 02, 2015 03:59 p.m. EST Reference Range:14.0 pg/mL - 72.0 pg/mL 112.0 pg/mL (High) Date: Oct 22, 2014 11:37 a.m. EDT Reference Range:14.0 pg/mL - 72.0 pg/mL Age: Female Medications: Mom's meds: 5mg of Calcitrate in am & 5 in the pm; 3 Tums/day; 40 mg Magnesium/day