I have been suffering from stress and anxiety for a few weeks. I also have a history of severe?

It perhaps is the interactions between the 2 meds, diazepam & bupropion

MONITOR: Excessive use or abrupt discontinuation of benzodiazepines and other sedatives after chronic ingestion may precipitate seizures in patients receiving bupropion. Conversely, bupropion may antagonize the central pharmacologic effects of sedatives. Bupropion can cause agitation, anxiety, and insomnia and has been shown to decrease the sedative effect of diazepam in healthy volunteers given single doses of the drugs.

MANAGEMENT: Although sedatives may be prescribed to treat agitation, anxiety, and insomnia associated with bupropion use, patients should be alerted to the possibility of an increased risk of seizures during excessive exposure to these drugs. Patients should not attempt to alter the dosages or discontinue the medications on their own without consulting with their physician. The use of bupropion is contraindicated in patients undergoing abrupt discontinuation of sedatives.

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Read more: http://www.drugs.com/interactions-check.php?drug_list=440-0,862-0#ixzz10oJoFs5h

Please do talk to the doc/pharmacist who prescribed the meds, he/she could possibly check details change/alter the medication, take care, be well & above all safe!