I think that being happy is what is important in the long hair journey. I think if the ends are being tangly then that probably is an indication that you should trim. Have you tried using a chelating shampoo? I've heard that can help. Four inches is a lot, but should only take about 8 months to grow back if you have average growth.
You have said that you have thought about this for awhile now so normally I would say that the two week rule doesn't apply. You also mentioned that you had some weight gain and are hating every part of yourself. Perhaps you should put an extra couple of weeks thought into this. Start that diet/exercise routine. See if that starts to change how you are feeling in general. You don't want to cut just because you're in a funk. You probably still need a trim, but maybe not a whole four inches.
In the end though you have to be happy. If that four inches really is going to make the difference in your emotional well being then after those two weeks go for it. It is only hair and will grow back.
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