Many MANY converts to the faith feel just as you describe above - - That they are not leaving their faith, but rather finding the fullness of it in the Catholic Church.
Naturally the “emotions” will continue to be a “roller coaster ride”, because as you say that’s how emotions work. But as a Catholic we do not tie the strength of our faith to our emotions. In fact you will find a number of good works by great saints dealing with this.
To an extent you will find the same thing in the Catholic Church…

We had people come here and say how Catholics at church felt “cold” and “unwelcoming” etc…
Likewise there can be a certain amount of “politics” and “cliquishness” in parish affairs, but on the other hand, the sacraments are the sacraments, the Eucharist is the Eucharist.
There is an old saying that the Church is not a museum of saints but a hospital for sinners…
Yes - you will find much less of this in the Catholic Church. The great structure of the Church provides a different kind of freedom that is most liberating.
Thanks so much for the information. Continue to pray for me as I seek the truth and fullness for my relationship with Jesus, and that the resistance and negativity I have encountered from my family would subside.
Thank you.
graceandfaith