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SQL Server very slow all of a sudden

Our SQL Server 2014 is exceptionally sluggish today. I've ALTER INDEXed to Rebuild and Reorg the table keys and I've updated stats. If anything, retrieval response seems slower after having done that. There has been no recent updates to the tables, views or procedures, so no new indexes or joins. I'm thinking perhaps there is a space or index allocation or table size issue of some time. Actual space on the physical drives is fine. I'm no DBA. Can someone give me some hints as to where to look for possible issues?
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Vitor Montalvão
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How about the server memory and how much is reserved for the SQL Server instance?
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The server has 16G of memory. I don't know how much is reserved for SQL Server, but I'm running SQL Server 2014 Express which, I believe, allocates 1G per instance. There is one instance running. There is only one user connected.

I believe it may be that there is a particular query that is the problem, rather than overall memory/space issues, but not sure. Other queries seem to respond fast enough, but this one take quite a while, over a minute, whereas just yesterday it would complete in under 10 seconds.
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Vitor Montalvão
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I found the REAL problem