Can I get back to Skyrim from Sovngarde?
Solution 1:
When in Skuldafn:
The portal to Sovngarde is the only exit from Skuldafn and fast travel is not possible. [source]
So even if you could exit Sovngarde back, you would not be able to reach skyrim.
Your best option at this point is probably to load an older saved game, before going to Skuldafn.