This was exactly what I experienced in summer at China this year, no openvpn(not even commercial one or Linode self-hosted one), no ssh-tunnel, no other used-to-work vpn solutions.

For ssh it sometimes work for a few days then the whole IP/host is blocked.

I did not have to time try obfsproxy, shadowsock or whatever, but it really really sucked, to make things worse, my Nexus phone could not get any updates etc either, as Google is also _fully_ blocked, I felt I was back to Stone age there.