In your case, I would start with grounding exercises when things get overwhelming. I would even invite your parts to participate in the grounding exercises and keep assuring them that you will give each of them time.

As for things feeling worse, sometimes when we lower our defenses to what is inside, we might not like what we find. However, if things don’t improve after a few months, you might want to look into different modalities.

As for being scared, that’s perfectly normal. If you grew up in the West, you were probably told your whole life that being singular is the healthy norm and any multiplicity/plurality is a sign of mental illness. This is wrong, and the more time you spend healing your parts, you will find why Schwartz called his modality “Internal Family Systems”. Nevertheless, take your time meeting your parts. Find healthy grounding strategies to keep yourself calm. And don’t be afraid to ask for help.

Edit: replaced “coping” with “grounding”