Possible problem with my snowflake eel?

How long have you had him? Mine disappears for a day or two. I usually feed him every 3-4 days, he won't eat unless he is hungry. The last time he was out did he look ok? Was he swimming around or acting sick?
 
actually i looked at him this morning and hes not in his cave and hes just lying there and about a little way down from his head part of his body is swollen.
 
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