Mortgage Question?

[NA Collins]

I live in Southern CA. My house is worth $650, 000. My mortgage is $310,000 on the 1st at 30 years fixed, 5.78% (Payment $2400). My 2nd mortgage (Heloc) is for $117,000 at .5% above prime (Payment $800 and growing). I plan to live in the home at least 10 years. Should I refinance to stop the heloc rate from climbing? The payment has increased over $200 in the last year. Is a 30 year fixed the best mortgage?

Thanks for any input.