I suspect I am being drugged

I suspect I am being drugged

I suspect that my wife is mixing some kind of medicine in my food. She
is an anesthesiologist so has knowledge and access to drugs. Day
before yesterday I went to an emergency room and told the doctor about
my suspicion (without saying whom I suspected). He ordered a urine
test for commonly abused substances (full list of substances is
below). The test came clear. The doctor said that I was having an
anxiety attack and prescribed sleeping pills for 10 days. If the pills
do not cure the symptoms, I have to consult a general physician and/or
a psychiatrist.
----
My questions:
1) How difficult is it to beat the drug tests?
2) Are there drugs that can induce the symptoms I am having (listed
below)?
3) Can I myself order more comprehensive tests (forensic or medical
labs that will do tests without a doctor's prescriptions)?
----
The reason for my suspicion:
1) As an experiment, I did not eat dinner at home for two days. My
symptoms became a lot less severe.
2) Once, after dinner was served I switched my plate with my wife's.
She woke up in the middle of the night and did not sleep well.

I do not want to confront her directly because there is a possibility
that I actually am suffering from acute anxiety.
----
My symptoms:
1) I have no trouble falling asleep, but everyday, I wake up after
about 2 hours of sleep like clockwork. When I wake up, I am
immediately fully alert like a switch has been turned on. There is no
gradual, transitional process of "waking up".
2) After waking up, I do not feel sleepy for about 4-5 hours but I am
confused and disoriented. After being awake for 4-5 hours, I slowly
start feeling sleepy and drift into sleep. This sleep is very light
and I see unusually high number of dreams. This sleep lasts for less
than two hours.
3) During the day time I don't feel depressed but I am a little
disoriented, tired and cannot focus at work. In the morning I wake up
with a heavy head with sort of a "hangover". My condition is not like
when I miss a night's sleep, but more like when I had too much to
drink last night.
4) My appetite is suppressed (have lost about 8 pounds in two weeks).
There are other symptoms but my mail is already too long. And they may
be due to lack of sleep rather than due to any drug.
----
There has been no traumatic, stressful or disturbing event in recent
days. I have not switched home or job recently. (the doctor in ER
asked these questions)
--
Urine drug tests (all came out negative):
Benzodiazepines
Cocaine
Amphetamines
THC
Opiates
Barbiturates
--
My suspicions are true or I am imagining things, either way I want to
know. This state of uncertainty is tough for me.
Please answer:
1) How difficult is it to beat the drug tests?
2) Are there drugs that can induce the symptoms I am having (listed
below)?
3) Can I myself order more comprehensive tests (forensic or medical
labs that will do tests without a doctor's prescriptions)?

I will be greatly indebted to know the answeres.