Addiction and Suffering

I have experienced minor addictions lately, such as overeating or social media; these topics have been addressed on this site previously. I now have a more general question. I am wondering: which is more important between tolerating negative emotions and aspiring to healthier positive emotions and activities? Currently, both are quite difficult for me. Any suggestions as *how* to tolerate negative emotions, to let them arise, are welcome. Similarly, any suggestions about ideal ways to generate joyfulness and positive emotions would be useful as well. Thank you.