How soon can you refinance after bankruptcy?

What if your home is worth $700k and you have a $200k HELOC plus $423k mortgage?
Better idea just to sell or short sale? Payments total are $4818/mo and we make around $72k a year. I was thinking of a refi just to keep the house for about 3 years, then after rebulding our credit, sell it and down size.
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