4 yo with chronic digestive problems

Over the past year, my daughter has been struggling off and on with what basically amounts to a sluggish bowel. It started during a time of acute stress and after a scary event.

Symptoms include:
- tiptoe walking/ struggling to have a bowel movement
- very bloated belly, after most meals
- undigested food in stools
- passes very tiny stools
- bowel doesn't seem to really ever completely empty
- pale face
- red blotchy dots near diaper area
- yeasty little red rash near mouth after eating fruit/ sweets; gets more backed up with sweets

Newer symptoms (since introducing Lugols- antibacterial several weeks ago):
- dark circles under eyes
- diarrhea/ loose stools alternating with getting backed up
- less energetic/ more sleepy
- trouble falling asleep, waking up early

Vomiting used to be a problem until she was given Podo 30C in late September. After 2 days drinking a few pellets dissolved in a bottle of water, she slept for 14 hours, then completely cleaned herself out. She was quite regular for almost a month, then the problems returned.

Just in case it's of value, she had a big problem with recurrent chest infections/ asthma problems as a toddler. Diet has mostly reversed that, although she is still prone to coughs. She is very small for her age.

Upon using the software on this website, I was directed to Arsenicum Album. I ordered that and Podo both in 30C, and both should be here next week. I am new to homeopathy, so any suggestions about which of those might be better to use, and how to administer them- or even a different remedy altogether, would be greatly appreciated. Thanks in advance!